Thanks for reaching out. To confirm, is it happening on your uploaded videos? If yes, you might've disabled comments for those contents. Here's how to enable it: https://yt.be/help/QPgV . Otherwise, the owner of the video probably turned it off by choice. Hope this helps!
@TeamYouTube Hi, on The YouTube App on iPhone, the comment box (to put your comment in) is gone, how do I fix this
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Nope, not self uploaded
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